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Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Cash Flows from Operating Activities: |  |  |  |
Net loss |  | $ (17,954) | $ (11,135) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
Depreciation and amortization |  | 671 | 455 |
Share-based compensation |  | 1,364 | 295 |
Non-cash interest expense |  | 642 | 542 |
Change in fair value of convertible preferred stock warrant liability |  | 1,396 | (250) |
Cost of rental units purchased by customers |  | 148 | 118 |
Changes in certain assets and liabilities: |  |  |  |
Accounts receivable, net |  | (1,016) | (326) |
Inventory |  | (767) | (519) |
Prepaid expenses and other assets |  | (298) | (30) |
Accounts payable |  | (594) | (819) |
Accrued expenses |  | (1,461) | 331 |
Deferred revenue |  | (400) | (45) |
Deferred rent |  | (46) | (29) |
Net Cash Used in Operating Activities |  | (18,315) | (11,412) | $ (11,100)
Cash Flows from Investing Activities: |  |  |  |
Purchases of property and equipment and capitalized software |  | (650) | (319) |
Net Cash Used in Investing Activities |  | (650) | (319) |
Cash Flows from Financing Activities: |  |  |  |
Proceeds from issuance of common stock in initial public offering |  | 99,998 |  |
Payments of public offering costs | $ (3,465) | (3,465) |  |
Proceeds from exercises of stock options |  | 45 | 30 |
Proceeds from issuance of Series G convertible preferred stock, net |  |  | 14,825 |
Borrowings under credit facilities |  |  | 5,000 |
Payments of debt issuance costs |  |  | (1,015) |
Net Cash Provided by Financing Activities |  | 96,578 | 18,840 |
Net Increase in Cash and Cash Equivalents |  | 77,613 | 7,109 |
Cash and Cash Equivalents, Beginning of Period |  | 29,147 | 17,040 | 17,040
Cash and Cash Equivalents, End of Period | $ 106,760 | 106,760 | 24,149 | $ 29,147
Supplemental disclosure of cash flow information: |  |  |  |
Cash paid for interest |  | 2,057 | 1,492 |
Transfer of inventory to property and equipment |  | 235 | 248 |
Supplemental disclosure of non-cash financing activities: |  |  |  |
Allocation of proceeds from debt financing to convertible preferred stock warrant liability |  |  | $ 171 |
Conversion of convertible preferred stock into common stock |  | 187,136 |  |
Conversion of convertible preferred stock warrants into common stock warrants |  | $ 1,874 |  |

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